[OLINGO-1326] Support for $schemaversion system query option (OData 4.01)

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: (Java) V4 4.5.0
• Component/s: odata4-client, odata4-commons, odata4-samples, odata4-server
• Assignee: Unassigned
• Reporter: Tim Schmelmer
• Created: 20/Dec/18 18:42
• Updated: 20/Dec/18 18:42

Description

The OData 4.01 standard defines a $schemaversion system query option which can be used for versioning the APIs [1], [2].
However, if I am not mistaken, the current Olingo library does not support this option (given it was only introduced in OData 4.01, and Olingo so far only supports OData 4.0)
 
This feature request is to add support for this option, and to route to an appropriately annotated CSDL schema based on the value of the  $schemaversion option.
 
[1] http://docs.oasis-open.org/odata/new-in-odata/v4.01/cn02/new-in-odata-v4.01-cn02.html#_Toc495652485
[2] http://docs.oasis-open.org/odata/odata/v4.01/cs01/part1-protocol/odata-v4.01-cs01-part1-protocol.html#sec_SystemQueryOptionschemaversion